CN101185953A - Method for using as-cast state magnesium alloy to process superplastic forging formation - Google Patents
Method for using as-cast state magnesium alloy to process superplastic forging formation Download PDFInfo
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- CN101185953A CN101185953A CNA2007101930563A CN200710193056A CN101185953A CN 101185953 A CN101185953 A CN 101185953A CN A2007101930563 A CNA2007101930563 A CN A2007101930563A CN 200710193056 A CN200710193056 A CN 200710193056A CN 101185953 A CN101185953 A CN 101185953A
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Abstract
The invention relates to a method making use of an as-cast magnesium alloy to carry out superplastic forging. First an as-cast magnesium alloy is subject to upset forging for preforming and then a superplastic forging is carried out. The process of the upset forging for preforming is that a blank material is manufactured into a column-shaped blank with the ratio of height to diameter H/D ranging from 1.88 to 2.50, then the blank is upset forged into a preformed part in the condition with a temperature ranging from 300 to 430 DEG C, a strain rate ranging from 0.1 to 5s<-1> and a control compression amount ranging from 20 to 50 percent. 2 to 2.8 h anneal to the blank is carried out under the superplastic forging temperature of the magnesium alloy. The invention adopts the two-step forming process of the upset forging for preforming and superplastic forging to first processes the cast magnesium alloy into a structure which resembles a structure required by the superplastic forging through the upset forging for preforming, without the need of a complicated grain refining treatment, thus simplifying the technique. Simultaneously, the high strain rate superplastic nature of the magnesium alloy is applied to the superplastic forging so as to further enhance forging efficiency. As a whole, the forging forming efficiency is raised by more than 20 percent.
Description
(1) technical field
The present invention relates to a kind of method of utilizing as-cast state magnesium alloy to process superplastic forging formation.
(2) background technology
Magnesium alloy has the close-packed hexagonal lattice structure, and temperature-room type plasticity is poor, and the shaping working ability is limited, has limited the range of application of magnesium alloy on high performance structural member.The magnesium alloy superplasticity has excellent deformability, and the superplasticity isothermal forging process can significantly improve the plasticity of material, reduce the distortion of materials drag, have characteristics such as forging can once-forming complex-shaped, the high muscle of thin-walled, the mechanical performance of isothermal forging is even, dimensional stability good.The superplasticity isothermal forging has become the effective means of the high performance structural member shaping of aximal deformation value and complicated shape, can greatly improve the situation that magnesium alloy is difficult to be shaped, and improves the utilization rate and the forging precision of material.But realize superplastic forging require magnesium alloy have a fine grained texture (average grain size d≤10 μ m) of grade and lower strain rate (
) under carry out, as magnesium alloy all to carry out grain refining technology earlier and handle, as greatly than extrusion process, liquid process, rapid solidification (RS)/powder metallurgy (PM) technology, semi-solid-state shaping technology etc., therefore the superplasticity pretreating process is more numerous and diverse, superplasticity isothermal forging process forming speed is slow, and production efficiency is lower.
Discovering, for the industrial attitude Mg-Al-Zn series magnesium alloy that great majority have atypia fine grained texture, is that 340～420 ℃ and strain rate are 1 * 10 in deformation temperature
-4～1 * 10
-3s
-1Condition under show good superplasticity, especially the AZ70 magnesium alloy when deformation temperature is 380 ℃, show good high strain rate (
) the superplastic deformation behavior, percentage elongation is up to 161.5%.The high strain rate superplasticity behavior of industry attitude AZ70 has improved the grain refining treatment process and the lower problems such as forming efficiency of the desired complexity of traditional superplastic material, has stronger industrial application value.
For as-cast magnesium alloy billet forging and molding aximal deformation value structural member commonly used, the problem that has two aspects: although 1. the magnesium alloy superplasticity is comparatively loose to the requirement of tissue, but as-cast magnesium alloy still is difficult to reach the requirement of superplasticity to tissue, therefore be difficult to directly utilize superplasticity to realize the forging and molding of aximal deformation value structural member, need carry out complicated grain refining PROCESS FOR TREATMENT; 2. even with respect to conventional process superplastic forging formation, " high strain rate superplasticity " (
) have higher forming efficiency, but for suitability for industrialized production, efficient is still on the low side.
(3) summary of the invention
The object of the present invention is to provide a kind of method of utilizing as-cast state magnesium alloy to process superplastic forging formation, solve the problem that the as-cast magnesium alloy tissue is unfavorable for adopting superplastic forging technology, improve forging and molding efficient simultaneously.
The technical solution used in the present invention is as follows:
Utilize the method for as-cast state magnesium alloy to process superplastic forging formation, earlier with the thick preform of as-cast magnesium alloy pier, process superplastic forging formation then; The thick preforming technique of described pier is: it is 1.88～2.50 cylindrical blank that blank is prepared into ratio of height to diameter H/D, is 0.1～5s at 300～430 ℃, strain rate then
-1, decrement be under 20～50% conditions pier slightly for performing member, and the 2～2.8h that under the superplastic forging temperature of magnesium alloy, anneals.Process superplastic forging formation technology is under the superplasticity temperature of magnesium alloy, adopts corresponding strain rate to forge, same common process.
Forging and molding method of the present invention relatively is suitable for being processed into the preformed member that cross section is circle or sub-circular earlier, and then the forging that carries out superplastic forging.
Further, the ratio of height to diameter of described cylindrical blank is 1.90～2.30, and the performing member after the thick preform of pier is handled in this scope is organized more even, and grain size more approaches the requirement of superplastic forging to the blank tissue.
Further again, described annealing time is 2～2.5h, and reasonably annealing time can be avoided the appearance of mixed grain structure, can not cause obviously growing up of crystal grain again simultaneously.
In order to optimize the superplastic forging technological parameter, can select the Mg-Al-Zn series magnesium alloy as blank, utilize its high strain rate superplasticity that has further to improve forging efficient, process superplastic forging formation is at 340～420 ℃ of temperature, strain rate 0.0001～0.01s
-1Condition under carry out, preferred especially AZ70 magnesium alloy is at 380 ℃, strain rate 0.01s
-1Carry out superplastic forging under the condition.
The present invention has following advantage with respect to prior art:
The present invention adopts the thick preform of pier, two step of process superplastic forging formation forming technology, earlier as-cast magnesium alloy is processed into the tissue that tissue approaches the superplastic forging requirement by the thick preforming technique of pier, having solved needs to carry out the problem that complicated grain refining is handled in the existing method, simplify technology, improved forging efficient; The high strain rate superplasticity that magnesium alloy is had is applied in the superplastic forging simultaneously, further improves and forges efficient, and the efficient with as-cast state magnesium alloy to process superplastic forging formation improves more than 20% generally.
(4) description of drawings
Fig. 1 is embodiment 1～5 performing member schematic appearance among the present invention.
Fig. 2 is the outside drawing of forging in the embodiment of the invention 1.
Fig. 3 is the micro-organization chart of forging in the embodiment of the invention 1.
(5) specific embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1～5th, and utilizing has the last for being the forging of cylinder to the variable cross-section body of circular cone transition under the cylinder of deep hole, thin-walled in the preparation of as-cast magnesium alloy forging and molding method.
Embodiment 1
It is 2.25 cylindrical blank that AZ70 as-cast magnesium alloy blank is prepared into ratio of height to diameter H/D, then at 400 ℃, and strain rate 1s
-1Pier is thick under the condition, and decrement is 38%, obtains performing member, and shape as shown in Figure 1; 380 ℃ of even preheating 2h annealing; After performing member taken out from annealing furnace, the mould of putting into preheating immediately carried out punching, and 380 ℃ of mold temperatures, the strain rate of punching are 0.01s
-1, punching finish in the thin-walled forging of deep hole is arranged, as shown in Figure 2; Its microscopic structure is referring to accompanying drawing 3.
Embodiment 2
It is 1.90 cylindrical blank that AZ31 as-cast magnesium alloy blank is prepared into ratio of height to diameter (H/D), and then at 350 ℃, strain rate is 2s
-1Pier is thick under the condition, and decrement is 23.8%, obtains performing member, and shape as shown in Figure 1; 400 ℃ of even preheating 2.3h annealing; Then at 400 ℃ of temperature, strain rate 0.01s
-1Condition under punching, in the thin-walled forging of deep hole is arranged.
Embodiment 3
It is 2.50 cylindrical blank that AZ31 as-cast magnesium alloy blank is prepared into ratio of height to diameter (H/D), is 0.1s at 300 ℃, strain rate then
-1Pier is thick under the condition, and decrement is 48.1%, obtains performing member, and shape as shown in Figure 1; 400 ℃ of even preheating 2.5h annealing; Then at 400 ℃ of temperature, strain rate 0.01s
-1Condition under punching, in the thin-walled forging of deep hole is arranged.
Embodiment 4
It is 2.00 cylindrical blank that AZ70 as-cast magnesium alloy blank is prepared into ratio of height to diameter (H/D), is 3s at 400 ℃, strain rate then
-1Pier is thick under the condition, and decrement is 28.1%, obtains performing member, and shape as shown in Figure 1; 380 ℃ of even preheating 2.8h annealing; Then at 380 ℃ of temperature, strain rate 0.01s
-1Condition under punching, in the thin-walled forging of deep hole is arranged.
Embodiment 5
It is 2.20 cylindrical blank that AZ31 as-cast magnesium alloy blank is prepared into ratio of height to diameter (H/D), is 0.5s at 430 ℃, strain rate then
-1Pier is thick under the condition, and decrement is 35.8%, obtains performing member, and shape as shown in Figure 1; 420 ℃ of even preheating 2.5h annealing; Then at 420 ℃ of temperature, strain rate 0.008s
-1Condition under punching, in the thin-walled forging of deep hole is arranged.
Claims (5)
1. utilize the method for as-cast state magnesium alloy to process superplastic forging formation, it is characterized in that described method is first with the thick preform of as-cast magnesium alloy pier, then process superplastic forging formation; The thick preforming technique of described pier is: it is 1.88～2.50 cylindrical blank that blank is prepared into ratio of height to diameter H/D, is 0.1～5s at 300～430 ℃, strain rate then
-1Under the condition, the control decrement is that 20～50% piers slightly are performing member, and the 2～2.8h that anneals under the superplastic forging temperature of magnesium alloy.
2. the method for utilizing as-cast state magnesium alloy to process superplastic forging formation as claimed in claim 1, the ratio of height to diameter that it is characterized in that described cylindrical blank is 1.90～2.30.
3. the method for utilizing as-cast state magnesium alloy to process superplastic forging formation as claimed in claim 1 is characterized in that described annealing time is 2～2.5h.
4. as the described method of utilizing as-cast state magnesium alloy to process superplastic forging formation of one of claim 1～3, it is characterized in that described as-cast magnesium alloy is the Mg-Al-Zn series magnesium alloy, process superplastic forging formation is at 340～420 ℃ of temperature, strain rate 0.0001～0.01s
-1Condition under carry out.
5. the method for utilizing as-cast state magnesium alloy to process superplastic forging formation as claimed in claim 4 is characterized in that described as-cast magnesium alloy is the AZ70 magnesium alloy, and the process superplastic forging formation condition is 380 ℃ of temperature, strain rate 0.01s
-1
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101930563A CN100531954C (en) | 2007-12-05 | 2007-12-05 | Method for using as-cast state magnesium alloy for superplastic forging formation |
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| CNB2007101930563A CN100531954C (en) | 2007-12-05 | 2007-12-05 | Method for using as-cast state magnesium alloy for superplastic forging formation |
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| CN100531954C CN100531954C (en) | 2009-08-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447433A (en) * | 2013-09-04 | 2013-12-18 | 中南大学 | Preparation method of large-sized magnesium alloy forged disc |
| CN105274457A (en) * | 2015-10-23 | 2016-01-27 | 成都天智轻量化科技有限公司 | 3D super-plasticizing treatment method and superplasticity precision shaping method for magnesium alloy |
-
2007
- 2007-12-05 CN CNB2007101930563A patent/CN100531954C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447433A (en) * | 2013-09-04 | 2013-12-18 | 中南大学 | Preparation method of large-sized magnesium alloy forged disc |
| CN105274457A (en) * | 2015-10-23 | 2016-01-27 | 成都天智轻量化科技有限公司 | 3D super-plasticizing treatment method and superplasticity precision shaping method for magnesium alloy |
| CN105274457B (en) * | 2015-10-23 | 2017-09-19 | 成都天智轻量化科技有限公司 | The super plasticized processing methods of magnesium alloy 3D and superplasticity method for precisely forming |
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|---|---|
| CN100531954C (en) | 2009-08-26 |
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Application publication date: 20080528 Assignee: Zhuhai billion Die Casting Co., Ltd. Assignor: Zhengzhou University Contract record no.: 2010440000587 Denomination of invention: Method for using as-cast state magnesium alloy to process superplastic forging formation Granted publication date: 20090826 License type: Exclusive License Record date: 20100602 |
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